Grid-connected PV array with supercapacitor energy storage system for fault ride through

Abstract

A fault ride through, power management and control strategy for grid integrated photovoltaic (PV) system with supercapacitor energy storage system (SCESS) is presented in this paper. During normal operation the SCESS will be used to minimize the short term fluctuation as it has high power density and during fault at the grid side it will be used to store the generated power from the PV array for later use and for fault ride through. To capture the maximum available solar power, Incremental Conductance (IC) method is used for maximum power point tracking (MPPT). An independent P-Q control is implemented to transfer the generated power to the grid using a Voltage source inverter (VSI). The SCESS is connected to the system using a bi-directional buck boost converter. The system model has been developed that consists of PV module, buck converter for MPPT, buck-boost converter to connect the SCESS to the DC link. Three independent controllers are implemented for each power electronics block. The effectiveness of the proposed controller is examined on Real Time Digital Simulator (RTDS) and the results verify the superiority of the proposed approach.Index Terms--Active and reactive power control, fault ride through, MPPT, Photovoltaic system, RTDS Supercapacitor Energy storage I.978-1-4799-7800-7/15/$31.00 ©2015 IEEE

High-Level Penetration of Renewable Energy Sources Into Grid Utility: Challenges and Solutions

“…In [130], capacitor energy storage system is investigated for FRT improvement of distributed renewable energy generator. Since the supercapacitor has high power density, it is proposed as a potential solution to reduce short term power fluctuation in PV system during normal condition [131]. Also, during the grid side faults, energy generated by PV is stored in the supercapacitor to augment FRT capability of PV system.…”

Grid-connected photovoltaic power plants: A review of the recent integration requirements in modern grid codes

“…77 Most publications in the past focused only on ride through of the fault for either single-or 2-stage grid-connected PV power plants by overcoming the issues of dc-link overvoltage and ac overcurrent to keep the inverter connected during fault time but did not sufficiently deal with the reactive current injection during voltage dip. A method that applies the reactive power injection for the grid-connected PV power plant based on the German GC using a supercapacitor energy storage system was proposed by Worku et al 86 The supercapacitor energy storage system is connected-to-the-system via a bidirectional buck-boost converter and then to the dc link in which it provides the grid with-both-active and-reactive-power using specific control to support the utility-grid-duringthe fault. For instance, the method proposed by Ding et al 53 applied adaptive dc-link voltage control for a PV inverter to enhance the output waveform quality.…”

“…15 In the application of PVPPs connected into the utility grid, some researches were done on the configuration of a 2-stage inverter-based grid-connected PV power plant. A method that applies the reactive power injection for the grid-connected PV power plant based on the German GC using a supercapacitor energy storage system was proposed by Worku et al 86 The supercapacitor energy storage system is connected-to-the-system via a bidirectional buck-boost converter and then to the dc link in which it provides the grid with-both-active and-reactive-power using specific control to support the utility-grid-duringthe fault. But this control not only increases the-costbut-also-affects the reliability of the system.…”

Low Voltage Ride through Control Capability of a Large Grid Connected PV System Combining DC Chopper and Current Limiting Techniques

“…In the study of GCPSs, existing LVRT control strategies with dynamic voltage support (injection of reactive power), have been carried out on two-stage inverter based GCPSs. A method that applied the reactive power injection for GCPS based-on-German GC using-super capacitor energy-storage-system (SCESS) was proposed in [9].…”

“…The SCESS is connected-to-the-system via bi-directional buck-boost converter and then to dc-link in which it provides the grid with-both-active and-reactivepower using specific control in order to support utility-grid-during-the fault. But this control not only increases the-cost-but-also-effects the reliability of the system [8] [9]. A probabilistic fuzzy neural network intelligent control to regulate and control the reactive power value under grid faults was also proposed in [10].…”